more of -Wall fixes from Cristian Ionescu-Idbohrn.
Some are fixing real bugs.

function                                             old     new   delta
syslogd_main                                         938     958     +20
get_signum                                           136     143      +7
obj_load                                             777     782      +5
recv_from_to                                         210     214      +4
get_next_block                                      1795    1799      +4
display_topmem_process_list                         1117    1121      +4
logread_main                                         484     487      +3
buffer_fill_and_print                                 73      76      +3
kill_main                                            687     689      +2
ll_remember_index                                    240     241      +1
do_stats                                             452     453      +1
if_readconf                                          166     165      -1
display_process_list                                1192    1191      -1
run_applet_and_exit                                  507     505      -2
print_signames                                        33      31      -2
parse_one_line                                      1092    1090      -2
find_out_spec                                         57      55      -2
add_ksymoops_symbols                                 421     419      -2
ash_main                                            1407    1402      -5
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 11/8 up/down: 54/-17)            Total: 37 bytes

diff --git a/networking/sendmail.c b/networking/sendmail.c
index f37d97f..027656d 100644
--- a/networking/sendmail.c
+++ b/networking/sendmail.c
@@ -187,7 +187,7 @@
 	bb_error_msg_and_die("%s failed", msg);
 }
 
-static int inline smtp_check(const char *fmt, int code)
+static inline int smtp_check(const char *fmt, int code)
 {
 	return smtp_checkp(fmt, NULL, code);
 }
@@ -224,7 +224,7 @@
 	bb_error_msg_and_die("%s failed", msg);
 }
 
-static void inline pop3_check(const char *fmt, const char *param)
+static inline void pop3_check(const char *fmt, const char *param)
 {
 	pop3_checkr(fmt, param, NULL);
 }